Did I mess up here?
An update.
I think I've got the algae/bacteria under control after months of tweaking the artificial and natural light, hand cleaning and pruning the affected plants and adding more plants.
A week ago I added 4 serpae tetra. A day after one of my dojo loaches was dead.
Tbis is my 50/55 gallon tankm
All water parameters are ok: zero ammonia, zero nitrates, zero nitrites, pH at 7, temp at 74°F.
Measured before any of thus happened and re-measured after most recent water change, and first death (the first dojo)
Chalked it up to "it happens" and added 4 more serpae to make it a nice round 8. Also added half a dozen ottos.
This morning my second loach was found dead, one of my black skirt tetras as well and a second one (both whites) show fin damage.
Placed the injured one in a little fry container inside the tank for now, will treat him shortly. Seems otherwise in good spirits and I anticipate recovery.
Did I screw up this tank by adding the serpaes? I read before adding them, and besides an occasional mention of possible fin nipping, which everyone assured would not be an issue on a large group and big enough tank, went for them.
I've sat for 30 minutes at a time a couple if times observing the fish, I haven't seen any display of aggression, the serpaes seem to keep to themselves on whatever section of the tank they school together. Occasionally they will split up and swim around, but quickly regroup and again, as far as I could tell, do not bother anyone.
I'm fed up....